128664266663 has 4 divisors (see below), whose sum is σ = 130584628920. Its totient is φ = 126743904408.

The previous prime is 128664266657. The next prime is 128664266701. The reversal of 128664266663 is 366662466821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 366662466821 = 7 ⋅52380352403.

It is a cyclic number.

It is not a de Polignac number, because 128664266663 - 2⁸ = 128664266407 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128664266599 and 128664266608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128664236663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 960181028 + ... + 960181161.

It is an arithmetic number, because the mean of its divisors is an integer number (32646157230).

Almost surely, 2^128664266663 is an apocalyptic number.

128664266663 is a deficient number, since it is larger than the sum of its proper divisors (1920362257).

128664266663 is an equidigital number, since it uses as much as digits as its factorization.

128664266663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920362256.

The product of its digits is 17915904, while the sum is 56.

The spelling of 128664266663 in words is "one hundred twenty-eight billion, six hundred sixty-four million, two hundred sixty-six thousand, six hundred sixty-three".